[#BloombergLP-bslstl-BadWeakPtr]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslstl.adoc[bslstl]::BadWeakPtr
:relfileprefix: ../../
:mrdocs:

This `class` provides an exception type thrown when a `weak_ptr` object is locked after the managed object has been destroyed. This class conforms to the C++11 standard specification of `std::bad_weak_ptr`.

== Synopsis

Declared in `<bslstl_badweakptr.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
class BadWeakPtr
    : public std::exception
----

== Base Classes

[cols="1,4"]
|===
| Name| Description
| `std::exception`
| Base class for all library exceptions.
|===

== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslstl/BadWeakPtr/2constructor.adoc[`BadWeakPtr`]         [.small]#[constructor]#
| Create a `BadWeakPtr` object. Note that this function is explicitly user‐declared, to make it simple to declare `const` objects of this type.
| xref:BloombergLP/bslstl/BadWeakPtr/2destructor.adoc[`~BadWeakPtr`] [.small]#[destructor]# [.small]#[virtual]#
| Destroy this object.
| xref:BloombergLP/bslstl/BadWeakPtr/operator_assign-00.adoc[`operator=`] 
| 
| xref:BloombergLP/bslstl/BadWeakPtr/what.adoc[`what`]  [.small]#[virtual]#
| Return a pointer to the string literal "bad_weak_ptr", with a storage duration of the lifetime of the program. Note that the caller should _not_ attempt to free this memory. Note that the `bsls_exceptionutil` macro `BSLS_NOTHROW_SPEC` is deliberately not used here, as a number of standard libraries declare `what` in the base `exception` class explicitly with the no‐throw specification, even in a build that may not recognize exceptions.
|===



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